if (instance_exists(obj_greenspeargen))
{
    if (argument0 == 4)
        argument0 = floor(random(4));
    if (argument1 == 3)
        argument1 = floor(random(2));
    if (argument2 == 0 && argument1 != 2)
        argument2 = 1;
    if (argument3 == 0)
        argument3 = 1;
    obj_greenspeargen.spearmax += 1;
    obj_greenspeargen.speardir[i] = argument0;
    obj_greenspeargen.speartype[i] = argument1;
    obj_greenspeargen.timemod[i] = argument2;
    obj_greenspeargen.speedmod[i] = argument3;
    i += 1;
}